The following essay will deal with the science based theories of the origin of religion. If you are interested in faith-based theories, we suggest that you do a search on Google with a search string like: origin Christianity

Secular-based theories of religion:

Nobody knows with accuracy how the first religions evolved. By the time that writing had developed, many religions had been in place for many millennia and the details of their origins had been forgotten. However, there is speculation that the first religions were a response to human fear. They were created to give people a feeling of security in an insecure world, and a feeling of control over the environment where there was little control.

The developing abilities of proto-humans were a double-edge sword:

During their evolution from proto-human to full human, they developed questions about themselves and their environment:

Living in a pre-scientific society, people had no way to resolve these questions. Even today, with all of our scientific advances, we still debate about the second last question, and still have no way of reaching an consensus on the last. But the need for answers (particularly to the last question) were so important that some response was required, even if they were merely based on hunches. Some people within the tribe started to invent answers based on their personal guesses. Thus developed:

These formed an oral tradition which was disseminated among the members of the tribe and was taught to each new generation. Much later, when writing was developed, the beliefs were generally recorded in written form. A major loss of flexibility resulted. Oral traditions can evolve over time; written documents tend to be more permanent.

Unfortunately, because these belief systems were based on hunches, the various religions which developed in different areas of the world were all different. Their teachings were in conflict with each other. Because the followers of most religions considered their beliefs to be derived directly from God, they cannot be easily changed. Thus, inter-religious compromise is difficult or impossible. Also, because religious texts are often ambiguous, divisions developed within religions. Different denominations, schools, or traditions have derived different meanings from the same religious texts. Thus were laid the foundations for millennia of inter-religious and intra-religious conflict.

Evolution of religion:

The first organized religions appear to have been based on fertility. They were focused on the worship of the great Earth Goddess. Religion evolved to include male Gods who were gradually given increased importance by the priests. This development may have been caused by developing knowledge of the male's involvement in the process of reproduction.

Today, most people follow either:

Most religions teach that they were directly revealed by their deity/deities to humanity, and are unrelated to other world religions. However there is considerable historical evidence from ancient times that religions in the area from India to the Middle East shared many religious beliefs. One example of this are:

Religions were originally based on the particular beliefs of their founders and prophets.  Thus, there were few points of similarity among the various spiritual paths:

Religions today:

Some observers believe that modern-day religions are largely a response to human fear. Their main function is to provide their followers with a feeling of security while living in a dangerous environment in which a person can be injured, killed or murdered at any time due to natural causes, accidents or human hatred and intolerance.

John Shelby Spong, retired bishop of the Episcopal Church, USA has written:

"Religion is primarily a search for security and not a search for truth. Religion is what we so often use to bank the fires of our anxiety. That is why religion tends toward becoming excessive, neurotic, controlling and even evil. That is why a religious government is always a cruel government. People need to understand that questioning and doubting are healthy, human activities to be encouraged not to be feared. Certainty is a vice not a virtue. Insecurity is something to be grasped and treasured. A true and healthy religious system will encourage each of these activities. A sick and fearful religious system will seek to remove them."

David C. James, rector of St. John's Episcopal Church & Diocesan Mission Center in Olympia, WA, wrote:

Many times when we think we are worshipping God, we are actually comforting our very fragile egos. I’m not so naïve as to assume that we build temple and erect altars to ourselves…directly. But our core need to been safe, secure and sound mandates that we construct reality systems that will support us. ₂

Reference:

1. David Barrett et al, "World Christian Encyclopedia: A comparative survey of churches and religions - AD 30 to 2200," Oxford University Press, (2001). Read reviews or order this book safely from Amazon.com online book store
2. David C. James, "The Perils of Religion," St. John's Episcopal Church, at: http://stjohnsoly.org/